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package org.jf.smalidea.psi.impl;

import org.jetbrains.annotations.NotNull;
import org.jf.smalidea.SmaliTokens;
import org.jf.smalidea.psi.SmaliCompositeElementFactory;
import org.jf.smalidea.psi.SmaliElementTypes;

public class SmaliRegistersStatement extends SmaliCompositeElement {
    public static final SmaliCompositeElementFactory FACTORY = new SmaliCompositeElementFactory() {
        @Override public SmaliCompositeElement createElement() {
            return new SmaliRegistersStatement();
        }
    };

    public SmaliRegistersStatement() {
        super(SmaliElementTypes.REGISTERS_STATEMENT);
    }

    @NotNull
    private SmaliMethod getParentMethod() {
        return findAncestorByClass(SmaliMethod.class);
    }

    /**
     * Get the total number of registers for the method
     */
    public int getRegisterCount() {
        SmaliLiteral literal = findChildByClass(SmaliLiteral.class);
        assert literal != null;

        long registerCount = literal.getIntegralValue();
        // TODO: check for register count that's too large
        if (isLocals()) {
            SmaliMethod parentMethod = getParentMethod();
            return (int)registerCount + parentMethod.getParameterRegisterCount();
        }
        return (int)registerCount;
    }

    private boolean isLocals() {
        return findChildByType(SmaliTokens.LOCALS_DIRECTIVE) != null;
    }

}
